You didn't think I'd go through the whole month without giving you some good stuff, did you? All these pictures (and many more) can be found on my Pinterest Board Magic. The link to me on Pinterest is to your right under the heading 'Stalk Me. Ya Know Ya Wanna'
I could have kept going, but I decided this is more than enough to explore as everything on this list is a vast subject in and of itself. You could dedicate years to just studying one thing. I tried to pick a wide variety from many systems because in my experience, most Witches mix systems. It can be hard to advance due to a lack of higher information. Most Witches try to learn magick from other cultures and incorporate that into their personal practice. I don't know of any Witch that uses only one tradition.